Depends on the Jewish sect (the old saying "When there's two Jews, there are three opinions" applies). Generally there's no hell, in the sense of there being a fiery place of damnation waiting, at all times, for any sinner after he dies. There is Gehenna, a somber gray place much like the Asphodel Meadows of Hades. IIRC, depending on the tradition, souls either dwell there until the Last Judgment, or simply lie in the ground where they were buried until the same event. Only at that point, when the Meshioch has come, together with the end of the world, is a final judgment spoken by God, at which point sinners are cast into a fiery pit much like the Western conception of Hell and the good are taken to a new, idyllic world (cf. the world post-Ragnarok).
So there's no hell in the sense of it waiting for you right now, only at the end of time. You can make your peace with Adonai in that time. I'm not a practicing Jew, though (on the contrary, hoho), so I might be wrong.
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